【Abstract】With the rapid development of our economy， the vigorous development of transportation， traffic life makes us m......

【Abstract】A lot of college students still make poor performance in English listening. This paper attempts to make a st......

在对定位误差含义的多种解释进行分析、归纳的基础上,给出一个较为全面合理的定位误差定义。通过对定位误差产生的原因和常用计算......